<template>
  <h4>当前求和为：{{ sum }}</h4>
  <button @click="sum++">点我++</button>
  <hr />
  <h2>姓名：{{ name }}</h2>
  <h2>年龄：{{ age }}</h2>
  <h2>薪资：{{ job.j1.salary }}K</h2>
  <button @click="name += '~'">修改姓名</button>
  <button @click="age++">增长年龄</button>
  <button @click="job.j1.salary++">涨薪</button>
</template>

<script>
import { ref, reactive, toRefs, readonly, shallowReadonly } from "vue";
export default {
  name: "Demo",
  setup() {
    //数据
    let sum = ref(0);
    let person = reactive({
      name: "张三",
      age: 18,
      job: {
        j1: {
          salary: 20,
        },
      },
    });

    // readonly(数据对象) 把数据变为只读数据（深层次只读），不可修改
    // shallowReadonly(数据对象) 把数据变为只读数据（只考虑第一层数据，对象类型内的数据可以改变对象不可改变）
    person = readonly(person);
    // person = shallowReadonly(person)
    // sum = readonly(sum)
    // sum = shallowReadonly(sum)

    //返回一个对象（常用）
    return {
      sum,
      ...toRefs(person),
    };
  },
};
</script>

